Fixed radiocoupler



June 5, 1928.

M. SIEVEKING FIXED RADIOCOUPLER il 5 y,

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UNITED STATES MARTINUS SIEVEKING, D]? NEW YORK, N. Y.

FIXED RADIO COUPLER.

Application filed October 4, 1926.

This invention has reference to an inductance device used in radio receiving apparatus for producing a regenerative or feedback effect, and relates particularly to a device known as a coupler in a receiving circuit.

The main object of the present invention is to provide a combination of this character that will cause the regenerative effect without distortion or other injurious effects, and which will be non-radiating and also very selective, and which makes the circuit superregenerative and of increased volume with out distortion.

A further object of the invention is to provide an inductance device of this character in which the desired effects are produced by a fixed coupler. The tickler coil is provided with the usual taps and switch to divide the wave band. The tuning is done by the variable condenser.

In the accompanying drawing showing one embodiment of my invention,

Figure 1 is a perspective view of the device.

Fig. 2 shows in perspective the frame partly broken away to show the interior.

Fig. 3 is a transverse section.

Fig. 4 is a diagram showing the conventional circuit in which the fixed coupler is included in a three coil circuit.

Fig. 5 shows a switch.

In my invention I wind a coil preferably somewhat in the form of an ellipse or zone to constitute the tickler coil. I wind a sec ond coil also preferably in the general form of an ellipse or zone, but which is placed at a right angle to the tickler coil, and which crosses the tickler coil at two opposite places, it being understood that both coils are of single layer of insulated wire, such as enani eled wire. These coils are interlocked and form a single fixed unit. This arrangement is preferably wound over a form such as set forth in Fig. 2, of the drawing, separately, and comprises two somewhat elliptical bands or zones arranged at a right angle and closely wound. The tickler coil is wound first, and the secondary coil is wound over the tickler coil and crosses the latter. at a right angle at two opposite places. The two single layers of wire are in contact, but the insulation obviously prevents current passing from one to the other; this close proximity causes the great amount of induction.

Serial No. 139,327.

This arrangement is preferably wound over a form such as set forth in Fig.2 separately, and comprises two cylindrical bands or zones arranged at a right angle with flat portions at their two opposite intersections closely wound. As shown I provide two square blocks or plates 3 and 4. I also provide two half cylinder portions 5 and 6 that extend at their ends inside of the plates and each end is secured thereto by bolts 7. I also provide two similar plates 8 and 9 that are practically half cylinders, each provided with a tongue 10 at each end. These tongues are placed against the inner wall of the plates 3 and 4 and locked between the ends of the curved plates 5 and 6, and are secured by suitable bolts 11 at each tongue portion.

This frame will have, a tickler coil 12 wound on the outside of one of these cylinder forms, which wires will pass over the opposite plates 3 and 4, and will be in close contact at such portions. This coil is pro vided with taps 13, 14, 15, and 16 adjacent one terminal 17, so that the circuit between the other terminal 18 and this terminal will vary the effect of this coil. These terminal 1317 are connected with a suitable switch and thus the effective length of the coil can be varied. This coil is of suitable insulated wire such as enamel coated.

On the other cylindrical form I wind a coil 20, that will cross the coil 12, at the two plates 3 and 4, such wire being insulated, and they are brought in close contact at the two intersections on the flat plates. This coil 20 is shown with terminals 21 and 22. On this coil as a secondary, I wind a suitable primary coil which may be a short coil 23, at the middle portion of the secondary coil, and which may be separated therefrom by a layer of insulation 24 placed on the outside of the secondary. coil 20. This primary coil will be of a. cylindrical form, and also have two flat portions lying over the plates 3 and 4.

In this use of this device the primary and secondary may be connected in the circuit in any desired manner, such as indicated at P, and S, in the diagram. The tickler coil 12 will have its extremities connected in the plate circuit of the tube, one connection being at the terminal 18, while the other connection will be through the switch that will make connection with this coil by any one of the terminals 13 to 17, these taps serving to vary the eiiective portion of the tickler coil that is in circuit.

It will be observed that the inner'coil' I2 is formed of a single layer only; also the other coil 20 that crosses the coil 12 is of a single layer. The third coil is'also of a single layer, and as shown is separated from the second coil by a thin layer of insulation, that Will bring this coil in close proximity to both of the other coils.

lVhat I claim is:

In a radio induction circuit, a form comprising two substantially rectangular plate portions, a pairoii halt cylinder portions joined at the ends respectively to two oppo- MARTINUS SIEVEKTNG. 

